Swivel exerciser

Abstract

A swivel exerciser includes a base having two front legs, a rear leg, a head tube in a center of a front portion, and two spaced hand grips on a top end of the head tube. A sector-shaped plate on a top of the base includes two central pivot members. A curved rail is around a curved edge of the sector-shaped plate, with the rail being fixedly secured to the top of the base. Two pivotal arms are rearward splayed out of the pivot members respectively. Two knee plates are disposed on the other ends of the arms, and each includes a wheel disposed on the rail and adapted to move therealong. A projection is disposed at a joining portion of each arm and knee plate and includes a through hole. An inverted U-shaped bridge member is adapted to insert into the through holes to interconnect the projections or not.

1. A swivel exerciser comprising:
 a base comprising two spaced front legs, a rear leg, a head tube and a longitudinal member, with a foot disposed on a bottom end of the head tube and two spaced hand grips disposed on a top end of the head tub, wherein the base is elevated by each of the two spaced front legs, the rear leg and the foot; 
 a sector-shaped plate disposed on a top of the base and comprising two central pivot members, with the longitudinal member extending from a front portion of the sector-shaped plate, with the head tube secured to the longitudinal member, with the two spaced front legs extending below the sector-shaped plate and located on opposite sides of the longitudinal member, with the two spaced front legs spaced from the longitudinal member and spaced from the head tube; 
 a curved rail disposed around a curved edge of the sector-shaped plate, with the curved rail being fixedly secured to the top of the base; 
 two pivotal arms rearward splayed out of the two central pivot members respectively; 
 a knee plate disposed on an end of each pivotal arm distal the pivot member and comprising a wheel disposed on the curved rail and adapted to move therealong; 
 a projection disposed at a joining portion of each pivotal arm and each knee plate and comprising a through hole; and 
 an inverted U-shaped bridge member, 
 wherein in a first operation mode, both ends of the inverted U-shaped bridge member are inserted into the through holes to interconnect the projections so that the knee plates can rotate as a whole; and 
 wherein in a second operation mode, the projections are not connected by the inverted U-shaped bridge member so that one knee plate can rotate independently of the other knee plate. 
 
     
     
       2. The swivel exerciser of  claim 1 , further comprising a projecting stop member on a top of each end of the curved rail for preventing the wheels from moving out of the curved rail, with the two spaced front legs located intermediate the projecting stop members on the curved rail and the rear leg. 
     
     
       3. The swivel exerciser of  claim 2 , wherein the longitudinal member has C-shaped cross sections, with the longitudinal member comprising a threaded hole, and wherein the head tube comprises a through hole and a locating screw driven through the through hole into the threaded hole to secure the head tube to the base, with the locating screw being driven in a direction intermediate the two central pivot members. 
     
     
       4. The swivel exerciser of  claim 1 , further comprising a through hole on one end of either pivotal arm, with the through holes being pivotably put on the pivot members respectively, and two fasteners each driven through the through hole into the pivot member so that the pivotal arms and the sector-shaped plate can be pivotably fastened together. 
     
     
       5. The swivel exerciser of  claim 4 , further comprising a protective cap disposed on each of the pivot members.